Aiming at improving the reconfiguration capability of an automatic testing system for turbine machinery, the method of object-orientation (OO) is employed to develop its software. Since the project size is small, we adopt a compact and pragmatic approach to construct this object-oriented application instead of using complicated commercial object-oriented methods. Although the method is simple, it covers all phases from collecting customer requirements to testing the code. In this paper, the five main phases of the object-oriented method including requirements capture, analysis, design, programming and testing are presented. The successful practical application proves that the adopted object-oriented method is efficient in software development.